Synthesis, Characterization and Study of Phenol Adsorption over MnOx-CeO2
Oriana D'Alessandro, Horacio Thomas and Jorge SambethAffiliation:
Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco" CINDECA - FCE, UNLP, CCT CONICET LA PLATA - 47 Nº 257 (1900) La Plata, Argentina.
AbstractFive MnOx-CeO2 samples with a molar ratio Mn-Ce between 0 and 100% were obtained by coprecipitation. The samples, which were called 10/0, 7/3, 5/5, 3/7, 0/10, were characterized by XRD, FTIR, XPS, specific surface area and TPR. Phenol was selected as pollutant. The adsorption of phenol from aqueous solution on Mn-Ce samples was carried out in a batch reactor at 25 and 50° C. The adsorption isotherms were described by Langmuir and Freundlich isotherm models and both model fitted. The characterization results showed the formation of solid solution where Mn3+ replaces Ce4+. The most active solid was Mn-Ce 7/3. The results showed that the adsorption process is a function of the Mn-Ce composition. Thermodynamics parameters ΔG0, ΔH0 and ΔS0 were calculated. These parameters indicated that the adsorption of phenol onto Mn-Ce was spontaneous and exothermic at 25 and 50 °C.
Adsorption, phenol, MnOx-CeO2
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